"use client";

import { useCallback, useEffect, useState } from "react";
import { pluginRegistry } from "@/lib/plugins/registry";
import type { PluginDefinition, PluginConfigField } from "@/lib/plugins/types";

interface PluginWithState extends PluginDefinition {
	enabled: boolean;
	config: Record<string, string | boolean>;
	missingDeps: string[];
	allDepIds: string[];
}

export function PluginsClient() {
	const [plugins, setPlugins] = useState<PluginWithState[]>([]);
	const [editing, setEditing] = useState<string | null>(null);
	const [toggling, setToggling] = useState<string | null>(null);

	const load = useCallback(async () => {
		try {
			const res = await fetch("/api/admin/plugins");
			const data = await res.json();
			const allDepIds = new Set<string>();
			for (const p of data.plugins ?? []) {
				if (p.dependencies) {
					for (const d of p.dependencies) allDepIds.add(d);
				}
			}
			const items: PluginWithState[] = (data.plugins ?? []).map(
				(p: PluginDefinition & { enabled: boolean; config: Record<string, string | boolean> }) => {
					const missing =
						p.dependencies?.filter(
							(d: string) => !allDepIds.has(d),
						) ?? [];
					return {
						...p,
						missingDeps: missing,
						allDepIds: Array.from(allDepIds),
					};
				},
			);
			setPlugins(items);
		} catch {}
	}, []);

	useEffect(() => {
		load();
	}, [load]);

	const toggleEnabled = async (id: string, current: boolean) => {
		setToggling(id);
		try {
			await fetch(`/api/admin/plugins`, {
				method: "PATCH",
				headers: { "Content-Type": "application/json" },
				body: JSON.stringify({ id, enabled: !current }),
			});
			load();
		} catch {}
		setToggling(null);
	};

	const saveConfig = async (id: string, config: Record<string, string | boolean>) => {
		try {
			await fetch(`/api/admin/plugins`, {
				method: "PATCH",
				headers: { "Content-Type": "application/json" },
				body: JSON.stringify({ id, config }),
			});
			setEditing(null);
			load();
		} catch {}
	};

	const hasDependencyIssues = (p: PluginWithState) =>
		p.dependencies?.length && p.missingDeps.length > 0;

	return (
		<div className="space-y-3">
			{plugins.length === 0 && (
				<div className="text-center py-12 text-sm text-[var(--admin-text-muted)]">
					No plugins registered.
				</div>
			)}
			{plugins.map((plugin) => (
				<div
					key={plugin.id}
					className={`admin-card p-4 flex items-start justify-between gap-4 ${!plugin.enabled ? "opacity-60" : ""}`}
				>
					<div className="min-w-0 flex-1">
						<div className="flex items-center gap-2 flex-wrap">
							<h3 className="text-sm font-semibold text-[var(--admin-text)]">
								{plugin.name}
							</h3>
							<span className="text-[0.55rem] font-bold px-1.5 py-0.5 rounded-full bg-[var(--admin-accent)]/12 text-[var(--admin-accent)]">
								v{plugin.version}
							</span>
							{!plugin.enabled && (
								<span className="text-[0.55rem] font-bold px-1.5 py-0.5 rounded-full" style={{ backgroundColor: "rgba(245,158,11,0.15)", color: "var(--admin-text)" }}>
									Disabled
								</span>
							)}
							{hasDependencyIssues(plugin) && (
								<span className="text-[0.55rem] font-bold px-1.5 py-0.5 rounded-full" style={{ backgroundColor: "rgba(239,68,68,0.15)", color: "var(--admin-text)" }} title={`Missing: ${plugin.missingDeps.join(", ")}`}>
									Missing deps
								</span>
							)}
						</div>
						<p className="text-xs text-[var(--admin-text-muted)] mt-1">
							{plugin.description}
						</p>
						<div className="flex items-center gap-3 mt-2 text-[0.6rem] text-[var(--admin-text-muted)]">
							<span>ID: {plugin.id}</span>
							{plugin.author && <span>Author: {plugin.author}</span>}
							{plugin.license && <span>License: {plugin.license}</span>}
							{plugin.dependencies && plugin.dependencies.length > 0 && (
								<span>Deps: {plugin.dependencies.join(", ")}</span>
							)}
						</div>

						{plugin.configFields && plugin.configFields.length > 0 && (
							<div className="mt-3">
								{editing === plugin.id ? (
									<ConfigForm
										fields={plugin.configFields}
										initial={plugin.config}
										onSave={(cfg) => saveConfig(plugin.id, cfg)}
										onCancel={() => setEditing(null)}
									/>
								) : (
									<button
										type="button"
										onClick={() => setEditing(plugin.id)}
										className="text-[0.6rem] font-bold px-2 py-0.5 rounded-full bg-[var(--admin-accent)]/10 text-[var(--admin-accent)] hover:bg-[var(--admin-accent)]/20 transition-colors"
									>
										Configure
									</button>
								)}
							</div>
						)}
					</div>

					<div className="flex-none">
						<label className="relative inline-flex items-center cursor-pointer">
							<input
								type="checkbox"
								className="sr-only peer"
								checked={plugin.enabled}
								disabled={toggling === plugin.id}
								onChange={() => toggleEnabled(plugin.id, plugin.enabled)}
							/>
							<div
								className={`w-9 h-5 rounded-full peer peer-checked:bg-[var(--admin-accent)] after:content-[''] after:absolute after:top-0.5 after:left-[2px] after:bg-white after:rounded-full after:h-4 after:w-4 after:transition-all peer-checked:after:translate-x-full ${toggling === plugin.id ? "bg-[var(--admin-accent)]/50" : "bg-[var(--admin-text-muted)]/30"}`}
							/>
						</label>
					</div>
				</div>
			))}
		</div>
	);
}

function ConfigForm({
	fields,
	initial,
	onSave,
	onCancel,
}: {
	fields: PluginConfigField[];
	initial: Record<string, string | boolean>;
	onSave: (config: Record<string, string | boolean>) => void;
	onCancel: () => void;
}) {
	const [values, setValues] = useState<Record<string, string | boolean>>(initial);

	const update = (key: string, value: string | boolean) => {
		setValues((prev) => ({ ...prev, [key]: value }));
	};

	return (
		<div className="space-y-2 p-3 rounded-lg bg-[var(--admin-surface)]/50 border border-[var(--admin-border)]">
			{fields.map((field) => (
				<div key={field.key}>
					<label className="text-[0.6rem] font-medium text-[var(--admin-text-muted)] block mb-1">
						{field.label}
					</label>
					{field.type === "text" && (
						<input
							type="text"
							value={(values[field.key] as string) ?? ""}
							onChange={(e) => update(field.key, e.target.value)}
							className="w-full px-2 py-1 text-xs rounded-md border border-[var(--admin-border)] bg-transparent text-[var(--admin-text)]"
						/>
					)}
					{field.type === "boolean" && (
						<label className="relative inline-flex items-center cursor-pointer">
							<input
								type="checkbox"
								className="sr-only peer"
								checked={(values[field.key] as boolean) ?? false}
								onChange={(e) => update(field.key, e.target.checked)}
							/>
							<div className="w-9 h-5 bg-[var(--admin-text-muted)]/30 rounded-full peer peer-checked:bg-[var(--admin-accent)] after:content-[''] after:absolute after:top-0.5 after:left-[2px] after:bg-white after:rounded-full after:h-4 after:w-4 after:transition-all peer-checked:after:translate-x-full" />
						</label>
					)}
					{field.type === "select" && field.options && (
						<select
							value={(values[field.key] as string) ?? ""}
							onChange={(e) => update(field.key, e.target.value)}
							className="w-full px-2 py-1 text-xs rounded-md border border-[var(--admin-border)] bg-transparent text-[var(--admin-text)]"
						>
							{field.options.map((opt) => (
								<option key={opt.value} value={opt.value}>
									{opt.label}
								</option>
							))}
						</select>
					)}
				</div>
			))}
			<div className="flex gap-2 pt-1">
				<button
					type="button"
					onClick={() => onSave(values)}
					className="text-[0.6rem] font-bold px-2.5 py-1 rounded-full bg-[var(--admin-accent)] text-[var(--admin-accent-foreground)]"
				>
					Save
				</button>
				<button
					type="button"
					onClick={onCancel}
					className="text-[0.6rem] font-bold px-2.5 py-1 rounded-full border border-[var(--admin-border)] text-[var(--admin-text-muted)]"
				>
					Cancel
				</button>
			</div>
		</div>
	);
}